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Phytic Acid-Assisted Formation of Hierarchical Porous CoP/C Nanoboxes for Enhanced Lithium Storage and Hydrogen Generation
ACS Nano ( IF 17.1 ) Pub Date : 2018-12-06 00:00:00 , DOI: 10.1021/acsnano.8b06039
Xuxu Wang 1, 2 , Zhaolin Na 1 , Dongming Yin 1 , Chunli Wang 1, 2 , Yaoming Wu 1 , Gang Huang 3 , Limin Wang 1, 2
Affiliation  

Application of transition metal phosphides (TMPs) for electrochemical energy conversion and storage has great potential to alleviate the energy crisis. Although there are many methods to get TMPs, it is still immensely challenging to fabricate hierarchical porous TMPs with superior electrochemical performances by a simple, green, and secure approach. Herein, we report a facile method to synthesize the CoP/C nanoboxes by pyrolysis of phytic acid (PA) cross-linked Co complexes that are acquired from reaction of PA and ZIF-67. The PA can not only slowly etch ZIF-67 and gain a hollow structure but also act as a source of phosphorus to prepare CoP/C nanoboxes. The CoP/C nanoboxes deliver an ultrahigh specific capacity (868 mA h g–1 at 100 mA g–1) and excellent cycle stability (523 mA h g–1 after 1000 cycles at 500 mA h g–1) when used as anode materials for lithium-ion batteries. Moreover, when used as an electrocatalyst for hydrogen evolution reaction, the CoP/C nanoboxes exhibit ultralow overpotential, small Tafel slope, and excellent durability in acidic media. The method to produce CoP/C nanoboxes is easy and environmentally friendly and can be readily extended to design other TMPs/C nanocomposites.

中文翻译:

植酸辅助的多层多孔CoP / C纳米盒的形成,以增强锂的储存和氢的产生

过渡金属磷化物(TMP)在电化学能量转换和存储中的应用具有缓解能源危机的巨大潜力。尽管有许多获得TMP的方法,但是通过简单,绿色和安全的方法来制造具有优异电化学性能的分级多孔TMP仍然是巨大的挑战。在这里,我们报告了一种简便的方法,可以通过热解从PA和ZIF-67反应中获得的植酸(PA)交联的Co配合物来热解CoP / C纳米盒。PA不仅可以缓慢蚀刻ZIF-67并获得中空结构,而且还可以作为磷的来源来制备CoP / C纳米盒。缔约方大会/ C nanoboxes递送超高比容量(868毫安汞柱-1在100mA克-1)和优异的循环稳定性(523毫安汞柱-1后以500mA hg的1000个周期-1)作为负极材料的锂离子电池中使用时。此外,当用作氢气分解反应的电催化剂时,CoP / C纳米盒具有超低的超电势,小的Tafel斜率和在酸性介质中的出色耐久性。生产CoP / C纳米盒的方法既简单又环保,可以很容易地扩展到设计其他TMPs / C纳米复合材料。
更新日期:2018-12-06
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